JP5232224B2 - How to report power headroom - Google Patents

How to report power headroom Download PDF

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JP5232224B2
JP5232224B2 JP2010512729A JP2010512729A JP5232224B2 JP 5232224 B2 JP5232224 B2 JP 5232224B2 JP 2010512729 A JP2010512729 A JP 2010512729A JP 2010512729 A JP2010512729 A JP 2010512729A JP 5232224 B2 JP5232224 B2 JP 5232224B2
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user terminal
set
trigger
power control
threshold
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JP2010530692A (en
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ミヒェル ユルゲン
インゲマン ペーダーセン クラウス
ローサ クラウディオ
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ノキア シーメンス ネットワークス オサケ ユキチュアNokia Siemens Networks Oy
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Priority to PCT/FI2008/050384 priority patent/WO2008155469A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/30TPC using constraints in the total amount of available transmission power
    • H04W52/36TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365Power headroom reporting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/14Separate analysis of uplink or downlink
    • H04W52/146Uplink power control

Description

  The present invention relates to the field of wireless communications. More particularly, the present invention relates to power control.

  The communications industry is in the process of developing a new generation of flexible and low-cost communications that includes high-speed access and also supports broadband services. Many features of third generation (3G) mobile communication systems have already been built, but many other features are not yet complete. The Third Generation Partnership Project (3GPP) is at the heart of these developments.

  One system in the third generation of mobile communications is the Universal Mobile Telecommunications System (UMTS), which transmits voice, data, multimedia, and broadband information to mobile customers as well as stationary customers. . UMTS is designed to accommodate increased system capacity and data capacity. Effective use of the electromagnetic spectrum is extremely important in UMTS. It is known that spectral efficiency can be achieved using frequency division duplex (FDD) or time division duplex (TDD) schemes. Space division duplex (SDD) is a third duplex transmission method used for wireless communication.

  As can be seen from FIG. 1, the UMTS architecture includes a user terminal 102 (UE), a terrestrial radio access network (UMTS Terrestrial Radio Access Network / UTRAN) 104, and a core network (CN) 126. The radio interface between the UTRAN and the UE is called Uu, and the radio interface between the UTRAN and the core network is called Iu.

  High-speed downlink packet access (HSDPA) and uplink high-speed packet access (HSPA) are further third generation mobile communication protocols in the high-speed packet access (HSPA) family. It is. These provide a smooth development path for UMTS-based networks and allow for higher data transmission rates.

  Evolved UTRAN (EUTRAN) is a newer project than HSPA and is said to bring 3G to the future. EUTRAN is designed to improve the UMTS mobile radiotelephone standard in order to meet various anticipated requirements. EUTRAN is often represented by the term Long Term Evolution (LTE) and is also associated with terms such as System Architecture Evolution (SAE). One of the purposes of EUTRAN is to enable all Internet Protocol (IP) systems to transmit IP data efficiently. This system uses only the PS / packet switched domain for voice and data calls. That is, this system includes Voice Over Internet Protocol (VoIP).

  Information on LTE can be found in 3GPP TS 36.300 (V8.0.0, March 2007), Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN)-Overall description; Stage 2 (Release 8) Can be found. These are included in the present invention by reference as a whole. Although UTRAN and EUTRAN are described in further detail below, it should be understood that EUTRAN is evolving over time.

  As can be seen from FIG. 1, the UTRAN is composed of a set of radio network subsystems 128 (RNS), each of which has a geographic coverage of a number of cells 110 (C). The interface between subsystems is called Iur. Each radio network subsystem 128 (RNS) includes a radio network controller 112 (RNC) and at least one NodeB 114, each NodeB having a geographical coverage of at least one cell 110. As can be seen from FIG. 1, the interface between the RNC 112 and the NodeB 114 is referred to as Iub, which is hard-wired rather than an air interface. There is only one RNC 112 for any NodeB 114. The NodeB 114 is used for radio transmission and reception with the UE 102 (NodeB antennas are typically found at the top of the tower or advantageously in less noticeable locations). The RNC 112 generally controls the logical resources of each NodeB 114 within the RNS 128, and the RCN 112 is also responsible for handover decisions, which may be a call switch from one cell to another or within the same cell. With call switching between radio channels in

  In a UMTS wireless network, a UE can support multiple applications of different quality of service operating simultaneously. In the MAC layer, a plurality of logical channels can be multiplexed into one transport channel. A transport channel can define how traffic from a logical channel is processed and sent to the physical layer. The basic data exchanged between the MAC layer and the physical layer is called a transport block (TB). This consists of an RLC PDU and a MAC header. During a period called transmission time interval (TTI), several transport blocks and other parameters are transmitted to the physical layer.

  In general, the uppercase or lowercase prefix “E” represents long-term evolution (LTE). E-UTRAN is composed of a plurality of eNBs (E-UTRAN Node B), and provides E-UTRA user plane (RLC / MAC / PHY) and control plane (RRC) protocol termination for UE. The plurality of eNBs are connected to the access gateway (aGW) via S1, and are interconnected via X2.

  An example of this E-UTRAN architecture is illustrated in FIG. E-UTRAN consists of multiple eNBs and provides E-UTRA user plane (RLC / MAC / PHY) and control plane (RRC) protocol termination for the UE. The plurality of eNBs are connected to an EPC (evolved packet core) through an S1 interface. EPC is composed of gateways such as MME (Mobility Management Entities) and / or Access Gateway (aGW). The S1 interface supports a many-to-many relationship between the MME and the eNB. A packet data convergence protocol (PDCP) is assigned to the eNB.

  In this embodiment, an interface X2 exists between eNBs that need to communicate with each other. In exceptional cases (eg inter-PLMN handover), LTE_ACTIVE inter-eNB mobility is supported by MME relocation over the S1 interface.

  The functions hosted by the eNB include the following functions, that is, radio resource management (radio bearer control, radio authentication control, connection mobility control, dynamic allocation of radio resources to UEs in both uplink and downlink) For mobility management entity (MME) selection in UE attachment, scheduling and transmission of paging messages (due to MME), scheduling and transmission of broadcast information (due to MME or O & M), mobility and scheduling Features such as measurement and measurement reporting configuration. Functions hosted by the MME include: distribution of paging messages to the eNB, security control, IP header compression, and encryption of user data streams; for paging reasons User plane packet termination; user plane switching to support UE mobility, idle state mobility control, bearer control of system architecture evolution (SAE), and NAS signal encryption and integrity protection .

  In mobile communications, the two basic types for power control are open loop and closed loop. In open loop power control (OLPC), a mobile terminal measures the power of a received pilot signal, and in accordance with the measured amount, the pilot transmission power, S (I) NR target value, interface level (these The transmission power density (PDS) is set based on the final value of In closed loop power control, the measurement is made at the other end of the connection, ie the base station. Then, this measurement result is transmitted back to the mobile terminal, whereby the mobile terminal can adjust its own transmission power. The term “base station” is widely used in the present application and applies to NodeB, eNodeB, and the like.

  Current trends in the art include uplink power control including: (i) an open loop power control mechanism at the terminal, and (ii) an eNodeB sends a closed loop power control modification command to the terminal. Option to do. The present invention solves the problems that occur during uplink power control and cooperative signaling from a terminal to a base station (eNodeB) in order to facilitate efficient uplink radio resource management decisions in the eNodeB.

  In the case of the uplink power control scheme, the eNodeB cannot know at which transmission power level different terminals are operated. This information is important for the eNodeB. This is because it is necessary to know this information for optimal radio resource management decisions, such as MCS (modulation and coding scheme) and transmission bandwidth allocation for different terminals. Therefore, in 3GPP, it has been argued that the terminal should be able to provide power control headroom reports to the eNodeB. The power control headroom report basically provides a measure of how close the power spectral density (PSD) of the terminal is to the maximum PSD limit. The maximum PSD can be derived from the maximum UE transmit power (typically assumed to be on the order of 24 dBm) and the minimum bandwidth (typically 1 PRB).

  Unfortunately, 3GPP has not yet found sufficient standards for sending power control headroom reports from user terminals to the eNodeB. In LTE uplink (UL), the eNodeB performs radio resource management decisions such as selection of UEs to transmit, allocation of transmission bandwidth to UEs, selection of MCS to be used (as described above), and scheduling. Do. These decisions are signaled to the terminal via a dedicated signal (eg, UL scheduling grant message). In order to make these decisions properly, the eNodeB should know the power level that the terminal is transmitting, or equivalent information (such as power control headroom information). Because from this information, the eNodeB estimates which MCS can now be supported by the target block error rate (BLER). This would not have been possible without the above information. Knowing the power spectral density used by the mobile terminal at the eNodeB is particularly important when selecting the transmission bandwidth (rather than the MCS). Not knowing exactly which PSD the mobile terminal uses when selecting MCS is significant in the case of slow AMC (in this case PSD is "automatically" increased / decreased when MCS is modulated) Influence.

  Therefore, it is necessary to report power headroom or equivalent information. However, reporting power control headroom is a trade-off between uplink signaling overhead and performance improvements obtained by making the information readily available at the eNodeB.

  It is problematic to have the terminal periodically report the power control headroom more frequently than the terminal's actual power spectral density (PSD) adjustment. Furthermore, the purpose of power adjustment at the terminal is basically to compensate (partially or completely) the transmission path loss (including antenna pattern, distance dependent transmission path loss and shadowing) between the eNodeB and the terminal. That is, the measurement of the transmission line loss is performed based on DL (for example, DL pilot channel). Even if the frequency of power adjustments that can occur at the terminal is high, if the measured transmission line loss has not changed, UL signaling can be a waste of resources; in addition, a closed loop power control command originates from the eNodeB, and If some of these instructions are misinterpreted at the UE, there will be significant problems with reporting. In this way, there arises a problem that the eNodeB does not know the used transmission power. The problem of power control commands being misinterpreted at the mobile terminal is a significant problem when relative closed-loop power control commands are used (this is also a working hypothesis in 3GPP).

  In HSUPA, the UE power headroom (UPH) is part of the scheduling information (SI), which is transmitted by the UE as part of the MAC-e header. If the UE is not allocated resources for scheduled data transmission, scheduling information can be transmitted periodically and / or can be transmitted based on a special trigger (eg, data When it arrives in the buffer). Otherwise, only periodic reporting is supported.

SUMMARY OF THE INVENTION Although the present invention is applicable in connection with E-UTRAN (LET or 3.9G), the principles of the present invention are not limited to the environment, but rather various wireless communications in the present and future. It can also be applied to systems and access technologies. The present invention provides a special reporting criterion that is an advantageous trade-off between signaling overhead and overall uplink performance for LTE. The following trigger criteria have been found to be very efficient for transmitting power control headroom reports on the uplink, optimizing uplink performance and minimizing signaling overhead.

  The first trigger criterion is that if a closed loop power correction of “n” is received by the terminal (sent from the eNodeB), the power control headroom is transmitted by the terminal over the next “m” transmission time interval (TTIs). To be measured and then reported to the eNodeB. The reason for this first criterion is that, as already mentioned above, closed-loop instructions may be misinterpreted at the terminal, so tracking power status at the eNodeB can lead to accumulation of such errors. Because. The problem of power control commands being misinterpreted at the mobile terminal is a significant problem when relative closed-loop power control commands are used (this is also a working hypothesis in 3GPP).

  The second trigger criterion is that after the terminal's open-loop power control algorithm modulates the PSD, the terminal measures the power control headroom over the subsequent “m” TTIs and then reports this to the eNodeB. is there. The third trigger criterion is to further limit the signaling of the uplink power control headroom report, so that the terminal will only receive a new power control headroom if the time since the last report exceeds “k” TTIs. Is to send a report.

  In place of the third trigger reference, the fourth trigger reference according to another embodiment of the present invention is that the absolute difference between the current transmission line loss measurement value and the last transmission line loss measurement value is a predetermined threshold value. Only if it is greater than p ", the terminal sends a new power control headroom report.

  These three quantities “n”, “m”, “k” (or “p” if a fourth trigger criterion is used instead of a third trigger criterion) as described above is eNodeB Is a parameter set by. For example, these parameters can be set by RRC signaling from the eNodeB to the terminal. These trigger criteria described above can be combined (eg, using a logical “OR” combination).

FIG. 1 is a diagram illustrating a UTRAN network. FIG. 2 is a diagram illustrating an LTE architecture. FIG. 3 shows a flowchart and an embodiment of the method of the present invention. FIG. 4 is a block diagram of the system of the method of the present invention.

DETAILED DESCRIPTION OF THE INVENTION In the following, advantageous embodiments of the invention will be described. This embodiment is merely an example for carrying out the present invention, and does not limit the scope of the description or the scope of application in other parts of the present application.

  In an advantageous embodiment, the reporting criteria are implemented at the terminal. However, protocols for signaling parameters “n”, “m”, “k”, and / or “p” require implementation at both the eNodeB and the terminal. Embodiments of the present invention provide an advantageous trade-off between signaling overhead and performance. As can be seen from FIG. 3, the method 300 begins at the base station. The base station adjusts 307 one or more thresholds “n”, “m”, “k” and / or “p” at the user terminal (UE) by signaling to the UE. At a later point in time, the UE determines that the trigger criteria have been met based on one of these thresholds being achieved (or some combination of these thresholds has been achieved). . This triggers the UE, which provides 325 a power control headroom report in the uplink. When a report is received 335 at the base station, the base station uses the report to provide 370 closed loop power control correction instructions to the user terminal.

  Referring to FIG. 4, a system 400 including a network element 492 and a user terminal 405 is shown according to an embodiment of the present invention. At the network element, the threshold adjustment module 468 instructs the transceiver 454 to send a threshold adjustment signal to the user terminal. At a later time, the trigger module 413 at the user terminal determines that the threshold has been reached, thereby instructing the transceiver 411 to provide a power control headroom report to the network element, This report is processed by the report receiving module 463. The report receiving module 463 supports the network element and allows the user terminal 405 to provide a closed loop power control correction instruction.

  Any of the embodiments described above can be implemented using a general purpose or application specific computer system with standard operating system software compliant with the methods described herein. The software is designed to drive the operation of specific hardware in the system and is compatible with other system components and I / O controllers. The computer system according to this embodiment includes a CPU processor including a single processing unit and a plurality of processing units that can be operated in parallel, or includes the CPU in one or more processing units (for example, a client) And servers). The memory may include any known type of data storage and / or transmission media including magnetic media, optical media, random access memory (RAM), read only memory (ROM), data cache, data objects, and the like. Further, similar to the CPU, the memory may reside in one physical location that includes one or more types of data storage, or may be distributed across multiple forms of physical systems.

  The detailed description of the drawings and the accompanying best mode does not imply a completely strict handling of the methods, systems, mobile devices, network elements and software products under consideration. One of ordinary skill in the art will understand that the steps and signals of the present invention represent a general cause-and-effect relationship that does not exclude various types of intermediate interactions, It will be understood that these steps and structures may be implemented in different sequences and configurations, using different combinations of hardware and software that need not be described in detail here.

  The present invention includes various concepts, which can be briefly described below without restricting future claims based on this provisional application. It should be understood that the following concepts can be further combined with each other in a variety of subordinate ways without departing from the scope of the invention.

Claims (21)

  1. Determining 315 that at least one set of trigger criteria has been met;
    In response to the determination that the set is satisfied, a power control headroom report is provided from the user terminal in the uplink (325);
    In method (300):
    The at least one trigger criterion comprises that the absolute difference between the current transmission line loss measurement and the most recent transmission line loss measurement has reached a difference threshold;
    A method (300) characterized by:
  2. Determining 315 that at least one set of trigger criteria has been met;
    In response to the determination that the set is satisfied, a power control headroom report is provided from the user terminal in the uplink (325);
    In method (300):
    The at least one trigger criterion comprises a plurality of received closed loop power corrections reaching a correction threshold;
    A method (300) characterized by:
  3. Determining 315 that at least one set of trigger criteria has been met;
    In response to the determination that the set is satisfied, a power control headroom report is provided from the user terminal in the uplink (325);
    In method (300):
    The at least one trigger criterion comprises that after modulation of open loop power control, the total number of transmission time intervals has reached a threshold of intervals after modulation;
    A method (300) characterized by:
  4. The threshold is adjustable by a signal to the user terminal, the method according to any one of claims 1-3.
  5. Means (413) for determining that at least one set of trigger criteria has been met;
    Means (411) for providing a power control headroom report in the uplink in response to the set being satisfied ;
    In a user terminal device (405) including:
    The at least one trigger criterion comprises that the absolute difference between the current transmission line loss measurement and the most recent transmission line loss measurement has reached a difference threshold;
    The user terminal device (405) characterized by the above.
  6. Means (413) for determining that at least one set of trigger criteria has been met;
    In response to said set are met, a means that provides power control headroom report in the uplink (411)
    In a user terminal device (405) including:
    The at least one trigger criterion comprises a plurality of received closed loop power corrections reaching a correction threshold;
    A user terminal device (405).
  7. Means (413) for determining that at least one set of trigger criteria has been met;
    In response to said set are met, a means that provides power control headroom report in the uplink (411)
    In a user terminal device (405) including:
    The at least one trigger criterion comprises that after modulation of open loop power control, the total number of transmission time intervals has reached a threshold of intervals after modulation;
    A user terminal device (405).
  8. The user terminal device (405) according to any one of claims 5 to 7 , wherein the threshold value can be adjusted by a transmitted signal .
  9. The means for determining (413) is a trigger module (413);
    The user terminal (405) according to any one of claims 5 to 8, wherein the means (411) for providing is a transceiver (411).
  10. A computer program,
    The computer program is stored in a processor ,
    A function for determining (315) that at least one set of trigger criteria has been met ;
    A function to provide a power control headroom report in the uplink from the user terminal in response to the set being satisfied (325) ;
    Is a program for realizing
    The at least one trigger criterion comprises that the absolute difference between the current transmission line loss measurement and the most recent transmission line loss measurement has reached a difference threshold;
    Computer program, characterized in that.
  11. A computer program,
    The computer program is stored in a processor ,
    A function for determining (315) that at least one set of trigger criteria has been met;
    A function to provide a power control headroom report in the uplink from the user terminal in response to the set being satisfied (325) ;
    Is a program for realizing
    The at least one trigger criterion comprises a plurality of received closed loop power corrections reaching a correction threshold;
    A computer program characterized by the above.
  12. A computer program,
    The computer program is stored in a processor ,
    A function for determining (315) that at least one set of trigger criteria has been met;
    A function to provide a power control headroom report in the uplink from the user terminal in response to the set being satisfied (325) ;
    Is a program for realizing
    The at least one trigger criterion comprises that after modulation of open loop power control, the total number of transmission time intervals has reached a threshold of intervals after modulation;
    A computer program characterized by the above.
  13. The threshold is adjustable by a signal to the user terminal, the computer program of any one of claims 10 to 12.
  14. In a network element (492) including a report receiving module (463) and a threshold adjustment module (468),
    The report receiving module (463), depending on the user terminal to determine that one set of trigger criteria are met even without low, configured to receive power control headroom report in the uplink from the user terminal It has been,
    The at least one trigger criterion comprises that the absolute difference between the current transmission line loss measurement and the most recent transmission line loss measurement has reached a difference threshold;
    A network element characterized by that.
  15. In a network element (492) including a report receiving module (463) and a threshold adjustment module (468),
    It said report receiving module (463) in response to the user terminal to determine that one set of trigger criteria are met even without low, configured to receive power control headroom report in the uplink from the user terminal It has been,
    The at least one trigger criterion comprises a plurality of received closed loop power corrections reaching a correction threshold;
    A network element characterized by that.
  16. In a network element (492) including a report receiving module (463) and a threshold adjustment module (468),
    The report receiving module (463), depending on the user terminal to determine that one set of trigger criteria are met even without low, configured to receive power control headroom report in the uplink from the user terminal Has been
    The at least one trigger criterion comprises that after modulation of open loop power control, the total number of transmission time intervals has reached a threshold of intervals after modulation;
    A network element characterized by that.
  17. The network element according to any of claims 14 to 16, wherein the threshold is adjustable by a signal transmitted from the threshold adjustment module (468).
  18. In a system (400) comprising a user terminal (405) having a trigger module (413) and a transceiver (411) and a network element (492) having a report receiving module (463) and a threshold adjustment module (468).
    The trigger module (413) is configured to determine that at least one set of trigger criteria has been met;
    Said transceiver (411), in response to the set is met, which is configured to provide a power control headroom report in uplink from the user terminal,
    Before Symbol report receiving module (463), depending on the user terminal to determine that one set of trigger criteria are met even without low, to receive a power control headroom report in the uplink from the user terminal Configured ,
    The at least one trigger criterion comprises that the absolute difference between the current transmission line loss measurement and the most recent transmission line loss measurement has reached a difference threshold;
    A system characterized by that.
  19. In a system (400) comprising a user terminal (405) having a trigger module (413) and a transceiver (411) and a network element (492) having a report receiving module (463) and a threshold adjustment module (468).
    The trigger module (413) is configured to determine that at least one set of trigger criteria has been met;
    Said transceiver (411), in response to the set is met, which is configured to provide a power control headroom report in uplink from the user terminal,
    Before Symbol report receiving module (463), depending on the user terminal to determine that one set of trigger criteria are met even without low, to receive a power control headroom report in the uplink from the user terminal Configured ,
    The at least one trigger criterion comprises a plurality of received closed loop power corrections reaching a correction threshold;
    A system characterized by that.
  20. In a system (400) comprising a user terminal (405) having a trigger module (413) and a transceiver (411) and a network element (492) having a report receiving module (463) and a threshold adjustment module (468).
    The trigger module (413) is configured to determine that at least one set of trigger criteria has been met;
    Said transceiver (411), in response to the set is met, which is configured to provide a power control headroom report in uplink from the user terminal,
    The report receiving module (463), depending on the user terminal to determine that one set of trigger criteria are met even without low, configured to receive power control headroom report in the uplink from the user terminal It has been,
    The at least one trigger criterion comprises that after modulation of open loop power control, the total number of transmission time intervals has reached a threshold of intervals after modulation;
    A system characterized by that.
  21. 21. The system of any of claims 18-20, wherein the threshold is adjustable by a signal transmitted from the threshold adjustment module (468) to the network element (492).
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